期刊
SCIENCE ADVANCES
卷 5, 期 5, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aav6090
关键词
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资金
- Japan Society for the Promotion of Science (JSPS) [JP18H03675, JP25000002]
- ANR grant GelBreak [ANR-17-CE08-0026]
- European Research Council [DLV-759187]
- Royal Society University Research Fellowship
- CNRS [7464]
- Agence Nationale de la Recherche (ANR) [ANR-17-CE08-0026] Funding Source: Agence Nationale de la Recherche (ANR)
Colloidal gels have unique mechanical and transport properties that stem from their bicontinuous nature, in which a colloidal network is intertwined with a viscous solvent, and have found numerous applications in foods, cosmetics, and construction materials and for medical applications, such as cartilage replacements. So far, our understanding of the process of colloidal gelation is limited to long-time dynamical effects, where gelation is viewed as a phase separation process interrupted by the glass transition. However, this purely out-of-equilibrium thermodynamic picture does not address the emergence of mechanical stability. With confocal microscopy experiments, we reveal that mechanical metastability is reached only after isotropic percolation of locally isostatic environments, establishing a direct link between the load-bearing ability of gels and the isostaticity condition. Our work suggests an operative description of gels based on mechanical equilibrium and isostaticity, providing the physical basis for the stability and rheology of these materials.
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